I am testing windows 10 these days from VirtualBox in host Linux Mint.. I need to be up to date a minimum with the latest windows for the job eventually, we still use 7 until 2020 which is starting to be quite old. Right now there is no network enable in my Virtualbox for my guest 10, and I am surprised I was even able to install the OS from a USB key without any internet access. (Very surprised)

Today I want to find a way to block everything coming out of that OS trough the internet (except firefox), even the daemon that will automatically adjust the clock. Is there an good open source software I can use, perhaps a firewall to block everything by default then I can add some rules manually for specific applications only?. A software with an effective real time monitor so I can see which application is trying to connect the internet too, just for the fun of learning what's truly happening.

A powerful networking funnel and an application that will not be bypassed by the OS.